Black Carbon Steel Pipe

ERW steel pipe, the full name of resistance welded steel pipe, uses the resistance heat generated by current flowing through the contact surface of pipe fittings and adjacent areas to weld pipe fittings, which has the advantages of smooth weld seam and high precision.
In terms of production technology, ERW steel pipes are strictly controlled from the time raw materials enter the factory, and high-quality steel products are selected to ensure their purity and chemical composition stability, laying a solid foundation for the performance of steel pipes. Advanced welding equipment and fine parameter control make the weld strength comparable to or even exceed the base metal.
In appearance, ERW steel pipe has standard roundness, uniform wall thickness and smooth inner and outer surfaces, which can effectively reduce the resistance of fluid transportation and efficiently transport various media. At the same time, it also has good mechanical properties, both strength and toughness. It can not only withstand certain pressure, but also adapt to stress tests such as bending and stretching in complex installation environment. It has outstanding performance in building structural support and mechanical manufacturing frame construction, providing solid guarantee for many engineering projects.

Visually inspect the surface state of high-frequency welded steel pipe to see whether there are obvious defects such as cracks, folds, pits and scratches, and check whether the weld appearance is uniform and smooth, and there are no welding defects such as undercut, incomplete penetration and flash. Use calipers, micrometer, ultrasonic thickness gauge and other tools to measure the geometric dimensions of steel pipes, such as outer diameter, inner diameter, wall thickness and length, to ensure that they meet the tolerance range stipulated in relevant standards.

Ultrasonic flaw detector is used to detect the weld and steel pipe body, and whether there are defects such as porosity, slag inclusion and cracks in the material can be detected through the propagation characteristics of ultrasonic waves. Eddy current testing equipment is used to detect the defects on the surface and near the surface of steel pipe, and the material change and defects are detected according to the principle of electromagnetic induction. For steel pipes with high requirements, X-ray inspection may also be used to obtain clearer and more accurate image information of internal defects.

Taking samples from steel pipes for tensile test, the tensile strength, yield strength, elongation and other mechanical properties are determined, and the strength and plasticity of steel pipes are evaluated. Conduct hardness tests, such as Brinell hardness and Rockwell hardness, to understand the hardness characteristics of steel pipes. The chemical composition of steel pipe is analyzed, and the contents of carbon, silicon, manganese, sulfur, phosphorus and other elements are detected to ensure that it meets the requirements of corresponding material standards and ensure the material quality and performance stability of steel pipe.